The 23-year old South Korean international has been the subject of interest from a lot of clubs in recent times, particularly Russians Rubin Kazan, with his representatives revealing that the Bundesliga duo are the latest outfits to be linked with the former FC Seoul man.

"The very much respected Bundesliga sides Werder Bremen and Bayer Leverkusen are holding an interest in Ki Sung-Yueng. Bremen already scouted him live," a spokesman for Ki's agents Global Sports Agent C2 told the Korea Times.